Add `refresh_events` to `CertHandler` #209

Job	Run time
PR / Check against ignorelist	7s
PR / Check against ignorelist	7s
PR / Quality Checks / Check the CHARMHUB_TOKEN secret	1s
PR / Quality Checks / Check the CHARMHUB_TOKEN secret	1s
PR / Quality Checks / Inclusive naming / check	10s
PR / Quality Checks / Inclusive naming / check	10s
PR / Quality Checks / Linting / Lint	12s
PR / Quality Checks / Linting / Lint	12s
PR / Quality Checks / Scenario Tests / Scenario tests	7s
PR / Quality Checks / Scenario Tests / Scenario tests	7s
PR / Quality Checks / Static Analysis / Static Analysis of Charm	14s
PR / Quality Checks / Static Analysis / Static Analysis of Charm	14s
PR / Quality Checks / Static Analysis / Static Analysis of Libs	13s
PR / Quality Checks / Static Analysis / Static Analysis of Libs	13s
PR / Quality Checks / Unit Tests / Unit tests	21s
PR / Quality Checks / Unit Tests / Unit tests	21s
PR / Quality Checks / Check libraries	46s
PR / Quality Checks / Check libraries	46s
PR / Quality Checks / CodeQL analysis / Analyze (python)	2m 7s
PR / Quality Checks / CodeQL analysis / Analyze (python)	2m 7s
PR / Quality Checks / Integration Tests / Integration Tests	10m 28s
PR / Quality Checks / Integration Tests / Integration Tests	13m 56s
	33m 0s

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